Table 5. Reliable change between each breathalyser.

	RCI	Change			No change
		$|\overline{x}{|}_{\mathrm{difference}}$	|σ|difference	N (%)	$|\overline{x}{|}_{\mathrm{difference}}$	|σ|difference	N (%)
Breathalyser 1–2	.0117	.013	.002	2 (7.14)	.004	.003	26(92. 86)
Breathalyser 1–3	.0117	–a	–	1 (3.57)	.003	.003	27 (96.34)
Breathalyser 2–3	.0117	.017	.001	2 (7.14)	.003	.003	26 (92.86)
All Comparisons	.0117	.014	.002	5 (5.95)b	.003	.003	79 (94.05)c

Notes.

^aaBAC was high for this reading (Breathalyser 1 aBAC = .193; Breathalyser 3 aBAC = .179).

^b$\overline{x}=.143$, σ = .044.

^c$\overline{x}=.086$, σ = .037.